Checkerbrick and checkerwork construction



A. J. HULsE, l 1,771,298

CHECKERBRIGK l AND CHEC-{ERWORK CONSTRUCT I-ON Fild Aug. 42o, 1928;

`' January 1 A Charles W, Andrews and Albert J. Hulse, and application Serial No. 255,314, filed February Y 18, 1928, by Charles W. Andrews. The first Patented July 22, 1930 UNITED STATES PATENT. oFFIcE ALBERI .'LIIULsE, or CHICAGO, ILLINOIS, AssIGNoR To H. A. BRAssrIR'r & COMPANY,

or CHICAGO, ILLINOIS, AcoRroRATIoN or ILLINoIs i CHECKERBRICK AND CHECKERWORK CONSTRUCTION Application ined August 2o, 192s. seriarNp. 360,901.

This invention relates to a new and improved' checkerbrick .and Ichekerworlr. con struction and more particularly to such a construction adapted for use in hot blast stoves 5 for blast furnaces. This invention is in the'nature of. an im- -provement or modiiication of the types of checkerbri'ck and checkerwork disclosed in Athe prior application, Serial No. 247,570, filed 1928, by Herman'A. Brassert,

application above referred todisclosed a form of construction having removable iiller brick I in the passages of the main brick and the second application-disclosed diierent'types ofV integral portions-on the brick extending into the passages.' l nl 2o In the present construction separate filler brick are 4used in thev passages in the main brick and the brick are so constructed as .to prevent displacement of the filler brick.

' Inhot blast stoves of usual design. the i11- teri'orof the stove 'is iilled, eXcept for the combustion chamber or vertical Hue,`with brick-- work adapted to absorb and later give up heat l'in the different portions ofthe cycle of operation. The vertical passages through or betweenithe brick have been made uniformin .dimension throughout the height of the stove. This uniformity of area vis not desirable as it causes increased velocity of the gases in the upper portion of the stove. In the upper porl tion of thestove the heating gases are at their According to the present invention liller blocks areprovided Jfor insertion in the passages, both between the main checkerbrick and in the ventical passages 'in said'brick. Brick of different size are provided so that the effective area of the passages may be varied in different portions of the furnace so as stoves and the like.

to modify correspondingly the velocity of the gases passing through the passages.l K'

It is an object ofthe present invention to provide new and improved checkerbrick for v,

It is a further object to provide a construction in which the passage areas may be modiiied in di'erent portions of the construction..

It is an additional object to provide a con-' struction in which the main and ller brick are fixed and, stable in predetermined relation.

Other and further objects will appear as the descriptionl proceeds.

A preferredembodiment of the invention has been .shown in lthe accompanying drawings, in which- Figure 1 is a fragmentary plan view, partly in section, showing a checkerwork formed according to the present invention;

Figure 2 is a perspectiveview of one of the' small filler brick; 4 f

Figure 3 is a similar view of one of the middle size filler brick; and i Figure 4 is a similar view of one of thev 75 largel filler brick. L

The main brick 11 are octagonal in `cross section and the alternate vlateral 'faces differ in size. .The .narrow .aces12 of adjacent brick engage' each other when the brick are 80 built up into a checkerwork as shown in Figure 1. The wider faces 13 of adjacent brick form the intermediate vertical passageway 14..

The brick 11 have the vertically extending passageways 15 formed therein. The main 85 portions of these passageways 1 5 are generally circular in contour with oppositely placed extensions 16 formed on lines which are tangential to the circle of the main portion of the -passageways These extensions render 90 the passageways non-circular in cross section.v

The small filler brick17 shown in perspective in Figure 2 have a central bulged portion 18. intermediate portions 19 with substantially parallel sides and ends 20 havingl 95 slopingor beveled edges'. As clearly'shown in Figure 1, the ends 20 fit into the extended portions 1,6 ot the passa geways 15 in the brick 11. This lit prevents the brick from being improperly placed in the passageways, or '100 from turning after having been. once putin place.- This is highly important as it will be' apparent .that if two superpqsed filler brick i be used in the vertical passages 14 and 15.

' structure willbe composed of brick 11 and 17, Q

the next portion with brick 11. and brick 21,' the next higher portion with brick 11 and 17 are placed at an angle to each other, there will be a reduced a'reafor passage of gas or air in the plane where the filler brick engage each other. Such a reduced area Will slow up the passage ofthe fluids and be detrimental to the efficient operation of the stove. This is prevented by the-present construction.

. An intermediate size of iller .brick 21 is shown in Figure 3,-'thi'sbrickbeing similar to the brick of Figure 2, with the exception that the central b'ulged portion 22 is of greater area. AA large size filler brick 23 is shown in' Figure 1, this brick having a still larger central portion 2 4. It will be understood that while. only three sizes of brick have been' shown, a greater or less-number of different sizes of brick may be used as desired.

[As clearly shown in Figure 1, the filler brick 17, 21 and 23 may also be used in theV In the construction of a checkerwork the brick shown, the lowermost portion ofthe brick 23 andthe topmost portion ,withbrick 11 only. This will give passageways having their greatest effective 'area at the 'top anddecreasing areas toward the bottom. A fewv eror greater number of different sections I'nay 40 be provided as desired. The brick may beso designed in relation to the temperatures of the gases to be used and the rate of heat transfer as to give an approximately constant velocity throughout the'height of the-furnace. A

variable velocity may be had if desired to conform to ydiffering rates of heat transfer a difference inI the heat head between the in diferentportions of the structure due to gases or air and the bricks in such different Aso portions of the stove structure.`

It will be apparent thatI if desired the brick 11 may be so placed in different portions of the structurethat the filler brick in said different portions will be at right angles to each other. If such portions are superposed, a space may be left without filler brick so that there will be no constriction of area between contacting, angularly related filler brick.

While one preferred form of construction has been shown by way of illustration, the sizes, shapes and proportions of the brick may be changed to meet varying conditions and such changes and modifications are contemplated as come within the spirit and scope of the appended 'claimsf with I claim: I 1. A checkerbrick. havinga, longitudinal -opening'extending therethrough, said opening having longitudinally extending portions extendingvinto 'the brick, whereby filler brick maybe locatedv` in the opening.

2. A checkerbrick having 'al longitudinal opening extending therethrough, said open.

ing having diametrically opposed longitudi-y nal portions 'extending into the brick, whereby filler brick may be located in the opening.

-' 3. A checker-brick' having an approxif mately cylindrical opening extendinglongitudinally therethrough, said opening having lateral extensions-having walls formed on intersectingplanes substantially tangential to thecylinder.

4, A checkerbrick having an approximately cylindrical opening extendingA longitudinally therethrough, said opening having diametrically opposed lateral extensions having walls formed on intersecting planes substantially tangential to the cylinder. i

5. A checkerbrick octagonal in cross section, alternate faces of the'octagon being similar in size, a longitudinal opening extending through tl'e brick, said opening havingdiametrically opposed longitudinal porr tions extending into the brick, whereby filler brick may be retained in predetermined position in the opening.

6. A checkerwork construction comprising a plurality of main checkbrick'assembled to form vertically extending ilues extending throughsuperposed brick, 'said flues being non-circular in cross section, and filler brick fitted into said i-lucs for the full height of the brick andiengaging the-'walls of the iluesto prevent rotation of said liller-brick.

7. A checkerwork construction comprising a plurality of main checkerbrick assembled to form vertically extending fines extending through superposed brick, said lues being non-circular in cross section, and filler brick `fitted into said fluesand engaging the Ywalls of the flues to prevent rotation of said filler brick', the filler brick in certain portions of said flues being greater in cross sectional area than those in other portions of said Hues.

8. A checkerwork construction comprising a plurality of main checkerbrick assembledto 'form vertically extending fines extending through superposed brick, said iues being non-circularin cross'section, and filler brick fitted into said flues and engaging the walls of the flues to preventrotation of said filler brick, the filler brick in lower portions'of said fines being greater incross sectional arca than liller'brick in portions of' said iiues thereabove. y

Signed at Chicago, Illinois, this 16th day' 

